At STPCon, a Performance Clinic was conducted to address web performance optimization (WPO), focusing on common issues found during live diagnostics of a 3D visualization app and an eCommerce website. The clinic highlighted several performance bottlenecks, such as excessive resources from a single domain affecting load times, inefficient JavaScript executions, and inadequate caching practices. Tools like Dynatrace, along with browser diagnostics, were used to analyze these issues, emphasizing the importance of employing WPO techniques like reducing roundtrips, leveraging CDNs, and optimizing JavaScript for better user experience. The discussion also pointed out the need for merging static content and improving server-side performance through application performance management (APM) tools to uncover backend inefficiencies, urging developers to expand their diagnostic approaches beyond just the frontend. Despite ongoing efforts to raise awareness about these basic optimization practices, such performance pitfalls still frequently occur, highlighting a persistent gap in addressing them effectively.